Abstract
The three-dimensional (3D) microstructures assembled by nanomaterials have attracted great attention due to their unique hierarchical structure and large surface area. In this study, the hierarchical nanosheets-assembled SnS2 hollow microspheres with an average diameter of 6.1 μm were synthesized via a facile hydrothermal method. Then Pt nanoparticles were deposited on the surface of SnS2 to form Pt/SnS2 nanocomposites using the in-situ reduction method. Compared with pristine SnS2-based sensors, the Pt/SnS2 sensors exhibited improved gas-sensing performances to NO2 gas, including higher sensitivity, shorter response time, and better selectivity. The superior sensing performance can be ascribed to the Schottky junction created between Pt and SnS2, along with the catalytic effect of Pt. Moreover, the adsorption energy of SnS2 and Pt-modified SnS2 for NO2 molecules was calculated using first principles based on density functional theory (DFT). The Pt modification can enhance the interaction of NO2 with the SnS2 surface, which is favorable for improving the gas-sensing properties. This work provides novel hierarchical SnS2 microspheres based gas sensors for NO2 detection.
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